A paper titled “Global Warming: A Geological Perspective,” published in Environmental Geosciences, and summarized below in Arizona Geology, should be required reading for all climate scientists. The paper notes that…
Global Warming: A Geological Perspective
From the summary paper:
” …A review of research on past temperatures and variations led us to the following conclusions:
1. Climate is in continual flux: the average annual temperature is usually either rising or falling and the temperature is never static for a long period of time.
2. Observed climatic changes occurred over widespread areas, probably on the global scale.
3. Climate changes must be judged against the natural climatic variability that occurs on a comparable time scale. The Little Ice Age, Medieval Warm Period, and similar events are part of this natural variability. These events correspond to global changes of 1 – 2 C.
4. Global temperatures appear to be rising, irrespective of any human influence, as Earth continues to emerge from the Little Ice Age. If the temperature increase during the past 130 years reflects recovery from the Little Ice Age, it is not unreasonable to expect the temperature to rise another 2 to 2.5 degrees Celsius to a level comparable to that of the Medieval Warm Period about 800 years ago. The Holocene Epoch, as a whole, has been a remarkably stable period with few extremes of either rising or falling temperatures, as were common during Pleistocene glacial and interglacial periods. Nevertheless, the Holocene has been, and still is, a time of fluctuating climate.
5. Climatic changes measured during the last 100 years are not unique or even unusual when compared with the frequency, rate, and magnitude of changes that have taken place since the beginning of the Holocene Epoch. Recent fluctuations in temperature, both upward and downward, are well within the limits observed in nature prior to human influence…. “
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